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KASAN: use-after-free Write in io_sendrecv_fail

Status: fixed on 2023/02/24 13:50
Subsystems: io-uring
[Documentation on labels]
Reported-by: syzbot+4c597a574a3f5a251bda@syzkaller.appspotmail.com
Fix commit: a75155faef4e io_uring/net: fix UAF in io_sendrecv_fail()
First crash: 721d, last: 698d
▶ ▼ Discussions (4)
Title Replies (including bot) Last reply
[PATCH liburing] test invalid sendmsg and recvmsg 2 (2) 2022/09/23 21:01
[PATCH for-next v2] io_uring/net: fix UAF in io_sendrecv_fail() 2 (2) 2022/09/23 21:01
[syzbot] KASAN: use-after-free Write in io_sendrecv_fail 0 (2) 2022/09/23 16:41
[PATCH for-next 1/1] io_uring/net: fix UAF in io_sendrecv_fail() 2 (2) 2022/09/23 14:31
▶ ▼ Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: uninit-value in io_sendrecv_fail io-uring C 29 174d 181d 25/28 fixed on 2024/04/10 03:59

Sample crash report:
==================================================================
BUG: KASAN: use-after-free in io_sendrecv_fail+0x3b0/0x3e0 io_uring/net.c:1221
Write of size 8 at addr ffff888021163080 by task syz-executor258/3615

CPU: 1 PID: 3615 Comm: syz-executor258 Not tainted 6.0.0-rc6-next-20220923-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:284 [inline]
 print_report+0x15e/0x45d mm/kasan/report.c:395
 kasan_report+0xbb/0x1f0 mm/kasan/report.c:495
 io_sendrecv_fail+0x3b0/0x3e0 io_uring/net.c:1221
 io_req_complete_failed+0x155/0x1b0 io_uring/io_uring.c:873
 io_drain_req io_uring/io_uring.c:1648 [inline]
 io_queue_sqe_fallback.cold+0x29f/0x788 io_uring/io_uring.c:1931
 io_submit_sqe io_uring/io_uring.c:2160 [inline]
 io_submit_sqes+0x1180/0x1df0 io_uring/io_uring.c:2276
 __do_sys_io_uring_enter+0xac6/0x2410 io_uring/io_uring.c:3216
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f8db2983dc9
Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffe363f568 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f8db2983dc9
RDX: 0000000000000000 RSI: 0000000000002a6e RDI: 0000000000000003
RBP: 00007f8db2947f70 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8db2948000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

Allocated by task 3615:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45
 kasan_set_track+0x21/0x30 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:371 [inline]
 ____kasan_kmalloc mm/kasan/common.c:330 [inline]
 __kasan_kmalloc+0xa1/0xb0 mm/kasan/common.c:380
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slab_common.c:934 [inline]
 __kmalloc+0x54/0xc0 mm/slab_common.c:947
 kmalloc include/linux/slab.h:564 [inline]
 io_alloc_async_data+0x9b/0x160 io_uring/io_uring.c:1590
 io_msg_alloc_async io_uring/net.c:138 [inline]
 io_msg_alloc_async_prep io_uring/net.c:147 [inline]
 io_sendmsg_prep_async+0x19b/0x3c0 io_uring/net.c:221
 io_req_prep_async+0x1d9/0x300 io_uring/io_uring.c:1613
 io_drain_req io_uring/io_uring.c:1645 [inline]
 io_queue_sqe_fallback.cold+0x281/0x788 io_uring/io_uring.c:1931
 io_submit_sqe io_uring/io_uring.c:2160 [inline]
 io_submit_sqes+0x1180/0x1df0 io_uring/io_uring.c:2276
 __do_sys_io_uring_enter+0xac6/0x2410 io_uring/io_uring.c:3216
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 3615:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45
 kasan_set_track+0x21/0x30 mm/kasan/common.c:52
 kasan_save_free_info+0x2a/0x40 mm/kasan/generic.c:511
 ____kasan_slab_free mm/kasan/common.c:236 [inline]
 ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1669 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1695
 slab_free mm/slub.c:3599 [inline]
 __kmem_cache_free+0xab/0x3b0 mm/slub.c:3612
 io_sendrecv_fail+0x2a4/0x3e0 io_uring/net.c:1220
 io_req_complete_failed+0x155/0x1b0 io_uring/io_uring.c:873
 io_drain_req io_uring/io_uring.c:1648 [inline]
 io_queue_sqe_fallback.cold+0x29f/0x788 io_uring/io_uring.c:1931
 io_submit_sqe io_uring/io_uring.c:2160 [inline]
 io_submit_sqes+0x1180/0x1df0 io_uring/io_uring.c:2276
 __do_sys_io_uring_enter+0xac6/0x2410 io_uring/io_uring.c:3216
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff888021163000
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 128 bytes inside of
 512-byte region [ffff888021163000, ffff888021163200)

The buggy address belongs to the physical page:
page:ffffea0000845800 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffffea0000854700 pfn:0x21160
head:ffffea0000845800 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffff888011841c80 dead000080100010 0000000000000000
raw: ffffea0000854700 dead000000000002 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1501, tgid 1501 (kworker/u4:5), ts 8710207687, free_ts 0
 prep_new_page mm/page_alloc.c:2538 [inline]
 get_page_from_freelist+0x1092/0x2d20 mm/page_alloc.c:4287
 __alloc_pages+0x1c7/0x5a0 mm/page_alloc.c:5546
 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2280
 alloc_slab_page mm/slub.c:1739 [inline]
 allocate_slab+0x213/0x300 mm/slub.c:1884
 new_slab mm/slub.c:1937 [inline]
 ___slab_alloc+0xac1/0x1430 mm/slub.c:3119
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3217
 slab_alloc_node mm/slub.c:3302 [inline]
 __kmem_cache_alloc_node+0x18a/0x3d0 mm/slub.c:3375
 kmalloc_trace+0x22/0x60 mm/slab_common.c:1014
 kmalloc include/linux/slab.h:559 [inline]
 kzalloc include/linux/slab.h:695 [inline]
 alloc_bprm+0x51/0x900 fs/exec.c:1510
 kernel_execve+0xab/0x500 fs/exec.c:1969
 call_usermodehelper_exec_async+0x2e3/0x580 kernel/umh.c:113
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888021162f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888021163000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888021163080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff888021163100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888021163180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (75):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/09/23 16:41 linux-next aaa11ce2ffc8 0042f2b4 .config strace log report syz C ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/16 14:54 linux-next aaa11ce2ffc8 67cb024c .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/15 23:54 linux-next aaa11ce2ffc8 67cb024c .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/15 17:48 linux-next aaa11ce2ffc8 67cb024c .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/15 14:00 linux-next aaa11ce2ffc8 67cb024c .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/15 07:30 linux-next aaa11ce2ffc8 67cb024c .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/14 22:05 linux-next aaa11ce2ffc8 4954e4b2 .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/13 16:34 linux-next aaa11ce2ffc8 adf90437 .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/13 00:16 linux-next aaa11ce2ffc8 89b5a509 .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/12 22:08 linux-next aaa11ce2ffc8 89b5a509 .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/12 10:36 linux-next aaa11ce2ffc8 16a9c9e0 .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/11 19:40 linux-next aaa11ce2ffc8 1353c374 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/09 09:34 linux-next aaa11ce2ffc8 aea5da89 .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/09 05:56 linux-next aaa11ce2ffc8 aea5da89 .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/09 00:46 linux-next aaa11ce2ffc8 aea5da89 .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/08 08:43 linux-next aaa11ce2ffc8 0de35f24 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/07 13:34 linux-next aaa11ce2ffc8 8a212197 .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/07 10:42 linux-next aaa11ce2ffc8 8a212197 .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/07 04:32 linux-next aaa11ce2ffc8 8a212197 .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/06 18:51 linux-next aaa11ce2ffc8 131b38ac .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/06 17:18 linux-next aaa11ce2ffc8 131b38ac .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/06 17:05 linux-next aaa11ce2ffc8 131b38ac .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/06 16:58 linux-next aaa11ce2ffc8 131b38ac .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/06 16:52 linux-next aaa11ce2ffc8 131b38ac .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/06 16:52 linux-next aaa11ce2ffc8 131b38ac .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/06 16:52 linux-next aaa11ce2ffc8 131b38ac .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/06 16:52 linux-next aaa11ce2ffc8 131b38ac .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/06 16:47 linux-next aaa11ce2ffc8 131b38ac .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/06 16:47 linux-next aaa11ce2ffc8 131b38ac .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/06 16:47 linux-next aaa11ce2ffc8 131b38ac .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/06 16:47 linux-next aaa11ce2ffc8 131b38ac .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/05 05:39 linux-next aaa11ce2ffc8 eab8f949 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/05 04:54 linux-next aaa11ce2ffc8 eab8f949 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/05 04:25 linux-next aaa11ce2ffc8 eab8f949 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/04 21:26 linux-next aaa11ce2ffc8 eab8f949 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/04 06:32 linux-next aaa11ce2ffc8 feb56351 .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/04 02:17 linux-next aaa11ce2ffc8 feb56351 .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/03 05:14 linux-next aaa11ce2ffc8 feb56351 .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/01 20:19 linux-next aaa11ce2ffc8 feb56351 .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/01 19:46 linux-next aaa11ce2ffc8 feb56351 .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/10/01 16:46 linux-next aaa11ce2ffc8 feb56351 .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/09/30 11:14 linux-next aaa11ce2ffc8 1d385642 .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/09/29 23:15 linux-next aaa11ce2ffc8 1d385642 .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/09/29 23:01 linux-next aaa11ce2ffc8 1d385642 .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/09/29 22:58 linux-next aaa11ce2ffc8 1d385642 .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/09/29 22:37 linux-next aaa11ce2ffc8 1d385642 .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/09/29 14:55 linux-next aaa11ce2ffc8 1d385642 .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/09/29 04:32 linux-next aaa11ce2ffc8 e2556bc3 .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/09/28 23:56 linux-next aaa11ce2ffc8 e2556bc3 .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/09/27 08:42 linux-next aaa11ce2ffc8 10323ddf .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/09/26 00:16 linux-next aaa11ce2ffc8 0042f2b4 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/09/25 20:10 linux-next aaa11ce2ffc8 0042f2b4 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/09/25 11:52 linux-next aaa11ce2ffc8 0042f2b4 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/09/25 00:10 linux-next aaa11ce2ffc8 0042f2b4 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/09/25 00:05 linux-next aaa11ce2ffc8 0042f2b4 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/09/23 14:04 linux-next aaa11ce2ffc8 0042f2b4 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/09/23 13:39 linux-next aaa11ce2ffc8 0042f2b4 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/09/23 13:13 linux-next aaa11ce2ffc8 0042f2b4 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/09/23 12:08 linux-next aaa11ce2ffc8 0042f2b4 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
2022/09/23 10:10 linux-next aaa11ce2ffc8 0042f2b4 .config console log report info ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Write in io_sendrecv_fail
* Struck through repros no longer work on HEAD.